问题: wait 后为什么不加for
He must wait a long time. In fact, he waited for two hours.
he wait a long time 为什么不写成wait for a long time?
解答:
(for) a long time
都可以,但习惯用wait for a long time.
wait for sb/sth (for)a long time.前一个for不能省．
for 句首时不能省．for all day.all前for必须省去.
原句时态可否改为：He must have waited (for) a long time. In fact, he waited for two hours.
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